"Kumar Sundaram" <spam@spammer.com> wrote in message news:<brnm9o$et5$1@grandcanyon.binc.net>...
> What is the real memory in the system(4Gig?), for the system details given
> below. How much
>
> virtual memory is in the system(3276MB?). Is the virtual memory sufficient
> enough.
>
> We experience lots of swaps in the application, though lsps -a shows only
> less than 5% used. Is vmstat ouput looking ok?
>
> lsattr -El sys0 output:
>
> --------------------------
>
> keylock normal State of system keylock at boot time False
>
> maxbuf 20 Maximum number of pages in block I/O BUFFER CACHE True
>
> maxmbuf 0 Maximum Kbytes of real memory allowed for MBUFS True
>
> maxuproc 800 Maximum number of PROCESSES allowed per user True
>
> autorestart false Automatically REBOOT system after a crash True
>
> iostat true Continuously maintain DISK I/O history True
>
> realmem 16777216 Amount of usable physical memory in Kbytes False
>
> conslogin enable System Console Login False
>
> fwversion IBM,M2P011204 Firmware version andrevision levels False
>
> maxpout 0 HIGH water mark for pending write I/Os per file True
>
> minpout 0 LOW water mark for pending write I/Os per file True
>
> fullcore false Enable full CORE dump True
>
> pre430core false Use pre-430 style CORE dump True
>
> rtasversion 1 Open Firmware RTAS version False
>
> top output:
>
> ------------
>
> load averages: 1.16, 2.12, 2.14 Tue Dec 16 11:36:42 2003
>
>
> Cpu states: 7.5% user, 5.1% system, 1.8% wait, 85.6% idle
>
>
> Real memory: 2618.9M free 4186757.3M procs 832.1M files 4190208.2M total
>
>
> Virtual memory: 0.0M free 3276.8M used 3276.8M total
>
> vmstat output:
>
> kthr memory page faults cpu
>

[snip]

In previous AIX versions, if you saw:

iostat true Continuously maintain DISK I/O history True

in the lsattr -El sys0, you would see some perf issues. I would turn
this off, unless you absolutely need it.

As for the original post, I still believe, as stated by several
others, there is no issue on this box. However, as for the
minperm/maxperm, is the "hard limit" (vmtune -h 1) set ?

BV

Hi Andreas, We can argue about this all day, the simple fact is that i
have dealt with more performance problems on AIX than I care to
mention. I know from experience that the users vmtune settings for
maxperm and minperm are too high becuase his AVM usage is no-where
near his realmem and his fs cache is too large forcing lrud to page
out working storage pages to paging space.... this is a common issue
as default maxperm is 80%, so aix will build 80% fs cace by default.
its not rocket science, its working as designed.

I am sorry it looks like i have ony read a portion of the vmstat and i
have guessed at the maxperm figures, but from the vmstat output i can
see the free list dropping below 100, which could mean that the
minfree is set to default also (120), it could also mean than the user
has set to something higher already, but if you read my post i
requested vmtume output after making the changes i have recommended..
i also have every right to assume that the system is running default
configs or the User would have told us of specific changes he has
made.. if he is not aware of any changes and he is responsible for the
system then its highly unlikely that he has changed any vmtune
settings.. but of course, the User can correct me on this, not you.

Even though I say that, the User has the opportunity to furnish the
thread with new information.. LIKE "i am am already running minfree
at 240 etc.." to which any one of us can react and change the
feedback we give..

I would usually not attempt any sort of supported performance analysis
without a full perfpmr run so i can look at the system as a whole, but
in this case a few simple / quick and easy recommedations can be made.

I work for the Best AIX suppport company in the world and have a
wealth of in depth experience to offer, i hope i put it to good use,
but maybe i can come across as a bit brash sometimes (*apologies for
that*).

Anyway, this is far to technical, Merry Xmas and Happy Holidays to ALL
AIX'ers and hope you don't get called out over the Xmas Period

Cheers
Mark Taylor